Tigger is a friend in the 100 Acre Wood. He made his first appearance in Kingdom Hearts, alongside with Roo to train Sora how to "bounce". Bouncing requires jumping on a specific tree coordinate and reach to the finish line. Tigger mostly uses Rabbit's farm as a bouncing spot, therefore ruining his vegetables, much to Rabbit's chagrin.
Tigger has a cheerful and out-going disposition. He is very competitive (in a friendly way) and has complete confidence in himself. Although he can seem very arrogant, he has a heart of gold and is willing to do anything to help his friends. While friendly in terms of the Hundred Acre Wood's storyline, Tigger is often found bothersome at times, as he engages Sora in many puzzles and/or games that involve his love for bouncing.
Tigger is also known for being slightly illiterate, for he often spells his name wrong, and he sometimes has difficulty pronouncing certain words.
As his name may suggest, Tigger is an anthropomorphized tiger with black-striped, orange fur covering most of his body, except for the fur on his belly and around his eyes and mouth, which is tan. His feet do not seem to have toes, and his thumbs are the only distinct digits on his hands, making it look like he is wearing some sort of blanket sleeper.
He has a long chin and a long, thin tail with a flat tip (likely due to his habit of bouncing on the end of his tail). He has small, close-set, black eyes and thick, brown eyebrows. Tigger also has a large, round pink nose and three black whiskers on either side of his upper lip.
Ten years later in Kingdom Hearts, the mini-game with Tigger ("Block Tigger") takes place in Rabbit's House; Sora is required to block Tigger from bouncing on Rabbit's crops. If Tigger does bounce on Sora's head or shoulders, Sora earns points. There is a "Rush" function at the bottom of the command menu, which enables Sora to get to Tigger on time (i.e. before he lands on Rabbit's crops and pushes them down).
He is also in the Giant Honey Pot Area, which he uses as bouncing spot. You have to follow Tigger's exact path across the area. If you fall or go to the wrong spot, you have to start over. Then he is in the minigame "Tigger's Giant Pot", where you have to whack the nuts back at the pot. When you successfully hit the pot, Tigger leaps up in the air. Tigger also is seen before the Pooh's Swing mini-game, when you talk to him he says his bouncing spot disappeared as well as Eeyore's tail.
Tigger provide Sora a new Sleight if he jumps around a stump.
The Kingdom Hearts II mini-game involves Tigger and Roo, and it also takes place in Kanga and Roo's House. This game also involves bouncing, but this time, Sora is required to bounce on rows and rows of balloons. Each balloon, if burst, gives Sora a number of points (in the form of yellow orbs). Also, he is one of the few allies who helps you get through the Spooky Cave mini-game.
Though he was based on and credited for first appearing in Winnie the Pooh and the Blustery Day and "Winnie The Pooh & The Honey Tree", Tigger's true first appearance was in A. A. Milne's book: "The House at Pooh Corner."
Tigger's original voice actor, Paul Winchell, had already retired before the Kingdom Hearts series was conceptualized and did not reprise the role, all the more in Kingdom Hearts II as he had already died in the time period between the releases of Kingdom Hearts and Kingdom Hearts II. Tigger is instead voiced in both games by Jim Cummings, his current official voice-actor, who also voices Winnie the Pooh, Pete, the Cheshire Cat, and others.
Tigger was created by real life Christopher Robin and was originally one of his stuffed toys.